Fabry-Perot cavities are perhaps the best known of the optical transmission resonators, with
cavity field enhancement accomplished by two parallel and partially reflecting planes.
Recently it has been shown that arrays of narrow slits cut into a metal substrate are similarly
able to exhibit resonant transmission modes. An analysis of the field solutions and
transmission properties of this resonant array is compared to the well-known etalon and
dielectric slab geometries, revealing a most elegant illustration of the principles of Maxwell's …